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For over a century, drosophila melanogaster have been used to study

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For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 25 Jul 2016, 06:12
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65% (01:48) correct 35% (02:05) wrong based on 299 sessions

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For over a century, drosophila melanogaster have been used to study genetics. Commonly known as fruit flies, drosophila lend themselves well to behavioral studies because they are small and easily handled, have short reproductive cycles, and are easily anesthetized with unsophisticated equipment. In the laboratory, fruit flies are confined in small glass containers to facilitate their anesthetization prior to examination for specific traits. It has been observed by several studies that the trait for short, less-powerful wings is dominate over that for large wings that enable longer flights. Thus, many geneticists theorize that shorter wings give drosophila an advantage in obtaining food sources in the wild.

The theory in the argument above is based on which of the following assumptions?

A. Fruit flies have no need to fly long distances in their search for food sources.

B. The social behaviors exhibited by drosophila indicate that shorter wings give individual flies an advantage in mating.

C. The common practice of confining drosophila to small containers does not affect the trait for wing size.

D. Fruit flies that are anesthetized on a regular basis mate just as frequently as those that are not.

E. The shorter reproductive cycles of drosophila are not influenced by the number of flies in a single container.
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Re: For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 25 Jul 2016, 09:23
Vyshak wrote:
For over a century, drosophila melanogaster have been used to study genetics. Commonly known as fruit flies, drosophila lend themselves well to behavioral studies because they are small and easily handled, have short reproductive cycles, and are easily anesthetized with unsophisticated equipment. In the laboratory, fruit flies are confined in small glass containers to facilitate their anesthetization prior to examination for specific traits. It has been observed by several studies that the trait for short, less-powerful wings is dominate over that for large wings that enable longer flights. Thus, many geneticists theorize that shorter wings give drosophila an advantage in obtaining food sources in the wild.

The theory in the argument above is based on which of the following assumptions?

A. Fruit flies have no need to fly long distances in their search for food sources.

B. The social behaviors exhibited by drosophila indicate that shorter wings give individual flies an advantage in mating.

C. The common practice of confining drosophila to small containers does not affect the trait for wing size.

D. Fruit flies that are anesthetized on a regular basis mate just as frequently as those that are not.

E. The shorter reproductive cycles of drosophila are not influenced by the number of flies in a single container.



Is it C
usually wings affect the behaviour, what if container affects the wing size? conclusion falls
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Re: For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 25 Jul 2016, 09:27
Vyshak wrote:
For over a century, drosophila melanogaster have been used to study genetics. Commonly known as fruit flies, drosophila lend themselves well to behavioral studies because they are small and easily handled, have short reproductive cycles, and are easily anesthetized with unsophisticated equipment. In the laboratory, fruit flies are confined in small glass containers to facilitate their anesthetization prior to examination for specific traits. It has been observed by several studies that the trait for short, less-powerful wings is dominate over that for large wings that enable longer flights. Thus, many geneticists theorize that shorter wings give drosophila an advantage in obtaining food sources in the wild.

The theory in the argument above is based on which of the following assumptions?

A. Fruit flies have no need to fly long distances in their search for food sources.

B. The social behaviors exhibited by drosophila indicate that shorter wings give individual flies an advantage in mating.

C. The common practice of confining drosophila to small containers does not affect the trait for wing size.

D. Fruit flies that are anesthetized on a regular basis mate just as frequently as those that are not.

E. The shorter reproductive cycles of drosophila are not influenced by the number of flies in a single container.


IMO A is the correct answer.

Premise 1 : For over a century, drosophila melanogaster have been used to study genetics. Commonly known as fruit flies, drosophila lend themselves well to behavioral studies because they are small and easily handled, have short reproductive cycles, and are easily anesthetized with unsophisticated equipment.

Premise 2: In the laboratory, fruit flies are confined in small glass containers to facilitate their anesthetization prior to examination for specific traits. It has been observed by several studies that the trait for short, less-powerful wings is dominate over that for large wings that enable longer flights.

Conclusion : Thus, many geneticists theorize that shorter wings give drosophila an advantage in obtaining food sources in the wild.

The unstated assumption is that fruit files need not fly for longer flights because the short and less powerful wings dominate the longer flies..

A) Negate : Fruit flies need to fly long distances in their search for food sources. Then the conclusion is weakened that shorter wings doesn't give any advantage for fruit flies for food search.

OA please...will correct if I missed anything...
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Re: For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 25 Jul 2016, 12:15
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I think it has to be C. If keeping the flies in glass containers affect the wing sizes than it's not right to theorise that short wings dominate and are used for sourcing food in wild, as it may happen that they used long wings for this purpose

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Re: For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 28 Jul 2016, 03:53
For over a century, drosophila melanogaster have been used to study genetics. Commonly known as fruit flies, drosophila lend themselves well to behavioral studies because they are small and easily handled, have short reproductive cycles, and are easily anesthetized with unsophisticated equipment. In the laboratory, fruit flies are confined in small glass containers to facilitate their anesthetization prior to examination for specific traits. It has been observed by several studies that the trait for short, less-powerful wings is dominate over that for large wings that enable longer flights. Thus, many geneticists theorize that shorter wings give drosophila an advantage in obtaining food sources in the wild.

The theory in the argument above is based on which of the following assumptions?

A. Fruit flies have no need to fly long distances in their search for food sources.

B. The social behaviors exhibited by drosophila indicate that shorter wings give individual flies an advantage in mating.

C. The common practice of confining drosophila to small containers does not affect the trait for wing size.

D. Fruit flies that are anesthetized on a regular basis mate just as frequently as those that are not.

E. The shorter reproductive cycles of drosophila are not influenced by the number of flies in a single container.

option B,D,E talks about reproduction & mating - Irrelevant

down to A & C

Option A is wrong - stimulus says longer wings enable longer flights it doesn't mean that shorter wings does not fly long distances

option C is correct - "In the laboratory, fruit flies are confined in small glass containers to facilitate their anesthetization prior to examination for specific traits. It has been observed by several studies that the trait for short, less-powerful wings is dominate over that for large wings that enable longer flights. Thus, many geneticists theorize that shorter wings give drosophila an advantage in obtaining food sources in the wild."

conclusion is drawn based on the experiment conducted. what if something went wrong during experiment and incorrect conclusions are drawn.
option C eliminates this possibility.
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Re: For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 10 Jan 2018, 13:36
C is an important and common pattern in assumption questions.
A is just a strengthener. Also, A talks about whether the "Fruit flies have no need to fly long distances" while the argument concerns about the advantage of wings in term of finding food sources.
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Re: For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 10 Jan 2018, 15:10
IMO OA is C

A. Fruit flies have no need to fly long distances in their search for food sources.
-> 'Flying long distance' is out of scope.
Conclusion is about shorter wings. We have to think about the advantage of shorter wings.
B. The social behaviors exhibited by drosophila indicate that shorter wings give individual flies an advantage in mating.
-> 'Mating' is out of scope.
Conclusion is about shorter wings. We have to think about the advantage of shorter wings.
C. The common practice of confining drosophila to small containers does not affect the trait for wing size.
-> Correct
D. Fruit flies that are anesthetized on a regular basis mate just as frequently as those that are not.
-> 'Regulat basis mate' is out of scope.
Conclusion is about shorter wings. We have to think about the advantage of shorter wings.
E. The shorter reproductive cycles of drosophila are not influenced by the number of flies in a single container.
-> 'Reproductive cycles' is out of scope.
Conclusion is about shorter wings. We have to think about the advantage of shorter wings.
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Re: For over a century, drosophila melanogaster have been used to study [#permalink]

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New post 10 Jan 2018, 17:37
Clearly C.It is not A because of the feature of the Assumption that IT HAS TO BE TRUE...

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Re: For over a century, drosophila melanogaster have been used to study   [#permalink] 10 Jan 2018, 17:37
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For over a century, drosophila melanogaster have been used to study

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